The Curb app is free to download for iPhone and Android devices.
Curb charges standard taxi fares that vary by city. A service fee of $1.95 is added to the fare to help support Curb technology upgrades and service improvements. An additional fee of $3.00 may be applied to rides that are booked in advance in select cities*.
You can also choose a tip at the end of your ride or set a default tip to be applied to all of your rides. The tip can be a percentage or dollar amount.
If you book a ride in the Curb app and cancel it more than 30 seconds after your driver has been assigned, you may be charged a $3.00 fee to compensate the driver.
*Advance booking fees of $3.00 are charged in New York City